CN105207062B - Self-test power distribution cabinet - Google Patents
Self-test power distribution cabinet Download PDFInfo
- Publication number
- CN105207062B CN105207062B CN201510684233.2A CN201510684233A CN105207062B CN 105207062 B CN105207062 B CN 105207062B CN 201510684233 A CN201510684233 A CN 201510684233A CN 105207062 B CN105207062 B CN 105207062B
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- Prior art keywords
- circuit
- grounding electrode
- control
- detection
- ion grounding
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/16—Earthing arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/325—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors involving voltage comparison
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a kind of self-test power distribution cabinets, it solves the problems, such as can not to learn whether the ion grounding electrode being connected with power distribution cabinet is intact and can not improve the ionizing power of ion grounding electrode, its key points of the technical solution are that the output terminal of leakage analog circuit is connected to export analog current with ion grounding electrode；Detection comparison circuit is used to detect the voltage between the output terminal and ion grounding electrode of leakage analog circuit to export detection signal；Control circuit is coupled to detection comparison circuit to receive detection signal, and exports control signal；Warning circuit is coupled to control circuit to receive control signal, and is alarmed in response to control signal with realizing；Compensation circuit is coupled to control circuit, and it is controlled by control circuit to be heated to ion grounding electrode, a kind of self-test power distribution cabinet of the present invention, by detecting in real time to be detected to ion grounding electrode, alarm is to remind operating personnel to repair if damage, simultaneously also by compensation circuit to improve the ionizing efficiency of ion grounding electrode.
Description
Technical field
The present invention relates to a kind of power supply unit, more specifically, it relates to a kind of self-test power distribution cabinet.
Background technology
Power distribution cabinet sub-power power distribution cabinet and light distribution cabinet, metering cabinet, are the final stage devices of distribution system, and power distribution cabinet is electricity
The general designation of motivation control centre, power distribution cabinet are used in the occasion that load is more dispersed, circuit is less；Motor control center is used for
The occasion that load is concentrated, circuit is more, they distribute to the electric energy of a certain circuit of upper level controller switching equipment load nearby, this
Grade equipment reply load provides protection, monitoring and control, if power distribution cabinet breaks down, entire distribution system can be caused very big
Influence, once so power distribution cabinet break down, then need to be overhauled as early as possible, and power distribution cabinet failure often bring leakage
The situation of electricity occurs, in order to ensure the safety of maintenance personal, by by the housing connecting earthing device of power distribution cabinet, to avoid appearance
The situation of electric shock.
There are two types of the species of earthing or grounding means：（1）Natural grounding；On the premise of it can reach ground resistance less than 4 ohm,
To save material, reducing workload, natural grounding can be paid the utmost attention to.Natural grounding is the feedwater of underground, draining or other gold
Metal conduit（Not comprising flammable liquid, flammable, explosive gas metallic conduit and the metallic conduit for being surrounded by megohmite insulant）, have metal
The cable of crust, metal well casing, building metal structure, basis of concrete steel building etc. are used as natural grounding substance,（2）
Artificial earthing；Generally make earthing pole with steel, length is more than 2.2 meters, after digging the hole of 1 meter of depth, squeezes into hole bottom vertically, embedment is deep
Degree is not less than 2 meters（3 meters away from ground）.
In the mode of the earthing or grounding means generally use artificial earthing of power distribution cabinet, and artificial earthing then uses ion grounding electrode,
Ion grounding electrode also known as electrolytic ion earthed system or hollow type earthed system, ion grounding system are grounded by advanced by sustained release
Pole（Include invertibity sustained release filler）, initiator and synergy electrolytic ion filler composition, excessively high direct of soil resistivity
The reason is that the additional conductive in default of free ion acts on, the filler outside earth conductor is to have strong water absorbing force, by force
Based on adsorption capacity and the high material of cation exchange property, it is mainly used for solving the humidity around earth conductor, ion generation contains
The problems such as amount, makes conductor combine closely with the earth, so as to reduce the contact resistance of electrode and soil, improves Soil Surrounding
Resistivity, conductor packing material contain special electron ion compound, can fully absorb the moisture in air, pass through deliquescence
Effect, active electron ion is released effectively in soil, with the water function in soil and air, is more promoted slow outside conductor
Drop resistance is released, and keeps resistance value steady in a long-term.So in the system of entire earthing or grounding means, filler is vital, and is filled
Agent can be then finished in long-term use either causes filler to be destroyed or due to extraneous soil in incorrect use
Quality the problem of filler can not be allowed to reach good effect, it is poor so as to cause the effect of ionization, so being connect using ion
Earth polar is grounded to power distribution cabinet there are certain hidden danger, if ion grounding electrode damage or there are during problem, the resistance value of ground resistance
Increase flows through ground resistance so as to cause on the housing of power distribution cabinet with leakage current, generates an electricity for being more than safe voltage
It presses and maintenance personal or other operating personnel is damaged, so the damage of ion grounding electrode can cause asking for personal safety
Topic, and used power distribution cabinet can not realize that improving ion grounding electrode ionizes effect and reduce the function of ground resistance at present.
After installation is complete, installation personnel can be detected it usual ion grounding electrode, and the detection is only being installed
After can carry out once again, will not be detected in real time afterwards, so as to can not know that ion grounding electrode is in use
It is no there are problem, no matter an and important ring of the power distribution cabinet as electric power system is required to ensure in repair or installation process
The security of its personnel, so the ion grounding electrode being connected with power distribution cabinet must be intact, and current used power distribution cabinet is not
There is the detection device that the detection carried out to ion grounding electrode is set, so as to can not in real time be examined to whether ion grounding electrode damages
It surveys, after occurring damaging, during power distribution cabinet is repaired, will result in unnecessary danger, so used at present
Power distribution cabinet has certain room for improvement.
The content of the invention
In view of the deficiencies of the prior art, the present invention intends to provide it is a kind of ion grounding electrode can be carried out it is real-time
The self-test power distribution cabinet of detection.
To achieve the above object, the present invention provides following technical solutions：A kind of self-test power distribution cabinet, including cabinet and ion
Earthing pole, the cabinet are connected with ion grounding electrode, and detection of electrical leakage is also connected in parallel between the cabinet and ion grounding electrode
Circuit, the electric-leakage detection circuit include leakage analog circuit, detection comparison circuit, control circuit, warning circuit and compensation electricity
Road；
The output terminal of the leakage analog circuit is connected to export analog current with ion grounding electrode；
The detection comparison circuit be used to detecting the voltage between the output terminal and ion grounding electrode of leakage analog circuit with
Output detection signal；
The control circuit is coupled to detection comparison circuit to receive detection signal, and exports control signal control electric leakage mould
Intend circuit, detection comparison circuit, warning circuit and compensation circuit；
The warning circuit is coupled to control circuit to receive control signal, and is alarmed in response to control signal with realizing；
The compensation circuit is coupled to control circuit, and is controlled by control circuit to be heated to ion grounding electrode；
When the detection comparison circuit detects between the output terminal and ion grounding electrode of detection leakage analog circuit exist
When voltage or voltage difference are more than second predetermined value, the control circuit control warning circuit alarm, when the detection is more electric
Road detects pre- more than first there are voltage or voltage difference between the output terminal and ion grounding electrode that detect leakage analog circuit
During definite value, the control circuit control compensation circuit compensates, and is compensated automatically according to detected voltage swing, with
Existing voltage difference between the output terminal and ion grounding electrode of counteracting leakage analog circuit；When the detection comparison circuit detects
When voltage being not present between the output terminal and ion grounding electrode of leakage analog circuit or when voltage difference is less than first predetermined value, institute
Control circuit control electric-leakage detection circuit is stated at predetermined intervals periodically to start.
Preferably, the detection comparison circuit is provided with several grades.
Preferably, the detection comparison circuit includes first order comparing unit, second level comparing unit compared with the third level
Unit；
The first predetermined value is a reference value of the first comparing unit；
The second predetermined value is a reference value of the second comparing unit；
The first order comparing unit, second level comparing unit, third level comparing unit are corresponded to according to voltage by small respectively
To the first estate distributed greatly, the second grade, the tertiary gradient；
The first order comparing unit is coupled between the output terminal and ion grounding electrode of leakage analog circuit, to export
Level-one comparison signal；
The second level comparing unit is coupled between the output terminal and ion grounding electrode of leakage analog circuit, to export
Two level comparison signal；
The third level comparing unit is coupled between the output terminal and ion grounding electrode of leakage analog circuit, to export
Three-level comparison signal；
The first order comparing unit, second level comparing unit, third level comparing unit are coupled with control circuit, described
Control circuit receives the first comparison signal so that compensation circuit to be controlled to work, and the control circuit receives second level comparison signal or the
Three-level comparison signal is to control warning circuit to be alarmed step by step.
Preferably, the warning circuit includes first order alarm unit and second level alarm unit；
The first order alarm unit corresponds to second level comparing unit, and the second level alarm unit corresponds to the third level
Comparing unit；
The first order alarm unit passes through light, audible alarm；
The second level alarm unit realizes alarm by cutting off the power.
Preferably, further include switching circuit；
The switching circuit is coupled to control circuit and receives the control of control circuit, which provides two kinds of work
Pattern is respectively detection manually with it is automatic detect receive external control instruction into line control circuit after two kinds of operating modes are carried out
Selection switching.
Preferably, the compensation circuit includes trigger element, driving unit and heating unit；
The trigger element is coupled to leakage analog circuit to receive analog current, and exports trigger signal；
The driving unit is coupled to trigger element to receive trigger signal, and output drive signal；
The heating unit is coupled to driving unit to receive drive signal, and is controlled by drive signal with to ion earthing
It heats pole.
Preferably, the trigger element is the monostable trigger unit being made of 555 chips.
A kind of detection method of self-test power distribution cabinet, wherein above-mentioned hardware or equipment, it is characterized in that：
Step 1：By switching circuit with to detect manually with automatically detection switch over；
Step 2：If manual detection, then button press is to control the leakage analog circuit output in electric-leakage detection circuit
Analog current, and perform step 4；
Step 3：If automatic detection, then the leakage analog circuit in control circuit control electric-leakage detection circuit is automatically defeated
Go out analog current, and perform step 4；
Step 4：The voltage between the output terminal and ion grounding electrode of comparison circuit detection leakage analog circuit is detected, if
When detecting the voltage detected by comparison circuit more than second predetermined value, then control circuit control warning circuit is alarmed, if
Detection comparison circuit detects that the voltage that voltage exists or detects is more than first predetermined value, then compensation circuit is controlled to start,
If the voltage that voltage exists or detects, which is not detected, in detection comparison circuit is less than first predetermined value, control circuit control warp
Step 1 is repeated after spending the predetermined S times；
Step 5：When the voltage between the output terminal and ion grounding electrode of leakage analog circuit falls into the second grade, then
Control unit controls first order alarm unit by light, audible alarm, when the output terminal and ion earthing of leakage analog circuit
When voltage between pole falls into the tertiary gradient, then control unit control simultaneously first order alarm unit by light, sound and
Second level alarm unit is by cutting off the power to realize same alarm.
The present invention compares compared with the prior art to be had：By detect comparison circuit to the output terminal of leakage analog circuit with from
Voltage between sub- earthing pole is detected, if the voltage detected by detection comparison circuit is more than second predetermined value, is controlled
Circuit control warning circuit processed is alarmed, while the voltage between the output terminal and ion grounding electrode of leakage analog circuit is fallen into
During the second grade, then control unit control first order alarm unit is carried out by light, audible alarm with reminding maintenance personal
Repair, is at this time safe from danger substantially to human body；When the voltage between the output terminal and ion grounding electrode of leakage analog circuit is fallen into
During the tertiary gradient, then control unit controls first order alarm unit to lead to by light, sound and second level alarm unit simultaneously
It crosses and cuts off the power to realize same alarm, it at this time can be to artificial into life danger because then being indicated in the tertiary gradient
Grade, avoids damaging maintenance personal or other operating personnel, to improve the security of repair；Whole process passes through control
Circuit is controlled, with realize timing cycle start, avoid the occurrence of in use ion grounding electrode damage and nobody learns
Situation, if detection comparison circuit detects that voltage exists or the voltage that detects is more than first predetermined value, control compensation
Circuit start to be heated to ion grounding electrode, improves the ionizing power of ion grounding electrode, so as to reduce ion grounding electrode with
Contact resistance between soil changes the conductive capability of soil, while also reduces the risk of ion grounding electrode damage.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the principle of the present invention block diagram；
Fig. 2 is the circuit diagram that comparison circuit is detected in the present invention；
Fig. 3 is the circuit diagram one of first order alarm unit in the present invention；
Fig. 4 is the circuit diagram two of first order alarm unit in the present invention；
Fig. 5 is the circuit diagram of second level alarm unit in the present invention；
Fig. 6 is the circuit diagram of switching circuit in the present invention；
Fig. 7 is the circuit diagram of compensation circuit in the present invention；
Fig. 8 is the circuit diagram of control circuit in the present invention.
In figure：1st, control circuit；2nd, leakage analog circuit；3rd, comparison circuit is detected；31st, first order comparing unit；32nd,
Two level comparing unit；33rd, third level comparing unit；41st, first order alarm unit；42nd, second level alarm unit；5th, switching electricity
Road；6th, compensation circuit；7th, cabinet；8th, ion grounding electrode.
Specific embodiment
Referring to figs. 1 to shown in Fig. 8, embodiment is described further.
A kind of self-test power distribution cabinet disclosed by the invention, including cabinet 7 and ion grounding electrode 8, cabinet 7 and ion grounding electrode 8
Connection, when installing ion grounding electrode 8, the 8 top surface depth of burying of ion grounding electrode is no less than 0.6 meter, and angle steel and steel pipe are grounded
Arranged perpendicular is answered in pole, and outside deionization earthing pole 8, the lead-out wire of ion grounding electrode 8 should do preservative treatment；During using zinc-coated flat steel sheet,
The bolted on part of lead-out wire should mend brush anti-decaying paint, while the shielding action to reduce adjacent earth polar, vertical grounding electrode
Spacing is no less than twice of its length, and the spacing of horizontal grounding pole should be according to design code, not preferably less than 5 meters, earthing pole with
The distance of building is not preferably less than 1.5 meters, and earthing pole should prevent mechanical damage and chemical attack, is grounded through wall
When should steel pipe or other firm protective cases be worn by bright sky, earthing pole main line at least should be in different 2 points and grounded screen phase
Connection, each grounded part of electric device should be connected with individual earthing pole with earthing pole main line, must not be in an earthing pole
Middle series connection is several to need grounded part, and having laid in the native ditch backfill of grounding body should not be added with stone, construction material or rubbish
Deng.
Electric-leakage detection circuit is also connected in parallel between cabinet 7 and ion grounding electrode 8, electric-leakage detection circuit includes electric leakage mould
Intend circuit 2, detection comparison circuit 3, control circuit 1, warning circuit and compensation circuit 6, the output terminal of leakage analog circuit 2 with from
Sub- earthing pole 8 connects to export analog current, and detection comparison circuit 3 is used to detect the output terminal and ion of leakage analog circuit 2
For voltage between earthing pole 8 to export detection signal, control circuit 1 is coupled to detection comparison circuit 3 to receive detection signal, and
Export control signal control leakage analog circuit 2, detection comparison circuit 3, warning circuit and compensation circuit 6, warning circuit coupling
In control circuit 1 to receive control signal, and in response to control signal to realize alarm, compensation circuit 6 is coupled to control circuit
1, and it is controlled by control circuit 1 to be heated to ion grounding electrode 8, when detection comparison circuit 3 detects detection leakage analog circuit 2
Output terminal and ion grounding electrode 8 between when being more than second predetermined value there are voltage or voltage difference, the control alarm of control circuit 1
Circuit alarm exists when detection comparison circuit 3 is detected between the output terminal of detection leakage analog circuit 2 and ion grounding electrode 8
When voltage or voltage difference are more than first predetermined value, control circuit 1 controls compensation circuit 6 to compensate, according to detected
Voltage swing is compensated automatically, to offset existing voltage between the output terminal of leakage analog circuit 2 and ion grounding electrode 8
Difference；When detect comparison circuit 3 detect between the output terminal of leakage analog circuit 2 and ion grounding electrode 8 be not present voltage when or
When person's voltage difference is less than first predetermined value, control circuit 1 controls electric-leakage detection circuit periodically to start at predetermined intervals.
In detection process, if ion grounding electrode 8 is intact, the resistance of ion grounding electrode 8 can be ignored, therefore directly
Ground connection, it is on ion grounding electrode 8 thus without voltage, so detection comparison circuit 3 can not detect voltage, if ion grounding electrode 8
Problematic, then ion grounding electrode 8 can be there are resistance, that is, when there are drain conditions, then the partial pressure of ion grounding electrode 8 obtains an electricity
Pressure, is compared by detecting comparison circuit 3 and being detected with the voltage, judges whether to need to alarm so as to control, it should be pointed out that
Thing, although just being allowed for not shown in Fig. 1 between Vi and Vo comprising resistance or equivalent resistance, actual conditions between Vi and Vo
The presence for having equivalent resistance is only possible to detect the voltage being wherein likely to occur, therefore only recognizes this point, just can be to this
Scheme in Invention figure 1 makes deep understanding, and the feelings of resistance are not present between the Vi and Vo in Fig. 1 and in non-ideality
Shape, and in the circuit connection of other parts, still treated in attached drawing of the present invention with ideal situation, it needs herein special to this progress
Explanation.
The voltage between the output terminal of leakage analog circuit 2 and ion grounding electrode 8 is examined by detecting comparison circuit 3
It surveys, if the voltage detected by detection comparison circuit 3 is more than second predetermined value, control circuit 1 controls warning circuit to carry out
Alarm, while when the voltage between the output terminal of leakage analog circuit 2 and ion grounding electrode 8 falls into the second grade, then control list
Member controls first order alarm unit 41 by light, audible alarm to remind maintenance personal to carry out maintenance, at this time to human body base
Originally it is safe from danger；When the voltage between the output terminal of leakage analog circuit 2 and ion grounding electrode 8 falls into the tertiary gradient, then control
Unit processed control simultaneously first order alarm unit 41 by light, sound and second level alarm unit 42 by cut off the power with
Same alarm is realized, at this time because then indicating it is that the artificial grade into life danger can be avoided to repair in the tertiary gradient
Personnel or other operating personnel damage, to improve the security of repair；Whole process is controlled by control circuit 1
System to realize that timing cycle starts, avoids the occurrence of ion grounding electrode 8 in use and damages and situation that nobody learns, if
Detection comparison circuit 3 detects that the voltage that voltage exists or detects is more than first predetermined value, then compensation circuit 6 is controlled to open
It is dynamic, to be heated to ion grounding electrode 8, the ionizing power of ion grounding electrode 8 is improved, so as to reduce ion grounding electrode 8 and soil
Contact resistance between earth changes the conductive capability of soil, while also reduces the risk that ion grounding electrode 8 damages.
In one embodiment, as shown in figure 8, control circuit 1 is preferably microcontroller, microcontroller is a kind of ic core
Piece, be using very large scale integration technology the central processor CPU with data-handling capacity, random access memory ram,
Read only memory ROM a variety of I/O mouthfuls and interrupts system, the functions such as timer/counter（May further include display driver circuit,
The circuits such as pulse-width modulation circuit, analog multiplexer, A/D converter）It is small and complete to be integrated into one formed on one piece of silicon chip
Kind microcomputer system, in industrial control field extensive use, and the use of microcontroller is simple, and control is convenient, therefore this hair
The microcontroller of preferred model MC9S08AC16,8 HCS08 central processing unit in bright（CPU）：40-MHz HCS08CPU
(central processing unit)；20-MHz internal bus frequencies, HC08 instruction set add BGND instructions；Background debugging system；Online
Single breakpoint can be set during debugging（It can increase two breakpoints in sheet sand covered pattern）；Debugging mode includes 2
Comparator and 9 trigger modes；8 FIFO store flow control address and event data；Debugging mode supports label and strong
Breakpoint processed；It supports to be up to 32 interruption/reset sources；Its memory option：The on piece online programmable FLASH storages of up to 16KB
Device has block protection and secure option；The on piece RAM of up to 1KB；Its clock source option：Clock source option includes crystal, buzzing
Device, external clock or is capable of the accurate of NVM adjustment and is internally integrated clock；Its system protection：Optional systems in operation
（COP）It resets, is run using independent internal clock source or bus clock；Low pressure detection is resetted or interrupted；Illegal operation symbol inspection
It surveys and resets；Illegal address detection resets；Its battery saving mode：Add two kinds of stop modes；Its external equipment：ADC-8 passages,
10 bit A/D converters include automatic comparing function；SCI- dual serial communication interface modules, optional 13 stop elements；SPI-
Serial Peripheral Interface (SPI) module；IIC- internal integrated circuit bus modules, can be operated on the maximum bus load of 100kps, subtract
Few load will allow higher baud rate；- 3 16 bit timing devices/pulsewidth modulations of timer（TPM）- 22 passages of module and 1
A 4 passage；Each timer has optional input capture on each passage, and output is compared, PWM.Each timer is every
It can be configured to band buffering, center PWM on a passage（CPWM）；KBI-7 pin keyboard interrupt module input/output；Up to
38 universal input/outputs（I/O）Pin；During input, there is the pull-up resistor that software selects in each port；During output, each
There is the conversion rate control that software selects in port；During output, there is the driving intensity that software selects in each port；Host reset
Pin and electrification reset（POR）；RESET, IRQ, BKGD/MS pin are pulled up in inside to reduce system consumption, by above strong
Big function, those skilled in the art can realize that the chip carries out the setting of peripheral circuit and the connection of external circuitry, together
When be also using other control circuits 1, such as PLC dispatch control systems.
In one embodiment, as shown in fig. 6, leakage analog circuit 2 can be preferably have current source, by current source by
It controls in control circuit 1, to realize output analog current, image current source circuit, micro-current source circuit and multichannel can also be passed through
Current source circuit is to provide analog current, and foregoing circuit is the prior art, therefore is no longer described in detail.
In one embodiment, detecting comparison circuit 3 includes a comparing unit, which is preferably LM393A models
Comparator, the in-phase end of the comparing unit is to receive between the output terminal of detection leakage analog circuit 2 and ion grounding electrode 8
Voltage, end of oppisite phase are connected with default reference voltage, and reference voltage is set by a resistance, pass through the voltage and benchmark detected
Voltage compares, and high level is exported if the voltage for occurring detecting is more than reference voltage, to export to control unit, control unit
Warning circuit alarm is controlled, it is on the contrary then do not alarm.
In one embodiment, as shown in Fig. 2, detection comparison circuit 3 is provided with several grades, by multistage setting with
It carries out separation judgement to detected voltage, and different voltage values, then corresponds to this 8 damaged condition of ion grounding electrode, therefore according to
According to the difference of the voltage value, three grades is preferably divided into, is the first estate, the second grade and the tertiary gradient, while three grades
Different type of alarms is corresponded to tackle different situations, improves security, the first estate is safety, and the second grade is presence
Certain risk is without damaging human body, and the tertiary gradient then easily causes to damage to maintenance personal or operating personnel
Evil.
Detecting comparison circuit 3 includes first order comparing unit 31, second level comparing unit 32 and third level comparing unit 33,
First predetermined value is a reference value of the first comparing unit, and second predetermined value is a reference value of the second comparing unit, the first order
Comparing unit 31, second level comparing unit 32, third level comparing unit 33 correspond to the distributed from small to large according to voltage respectively
One grade, the second grade, the tertiary gradient, first order comparing unit 31 is coupled to the output terminal of leakage analog circuit 2 and ion connects
Between earth polar 8, to export first order comparison signal, second level comparing unit 32 be coupled to the output terminal of leakage analog circuit 2 with
Between ion grounding electrode 8, to export second level comparison signal, third level comparing unit 33 is coupled to the defeated of leakage analog circuit 2
Between outlet and ion grounding electrode 8, to export third level comparison signal, first order comparing unit 31, second level comparing unit 32,
Third level comparing unit 33 is coupled with control circuit 1, and control circuit 1 receives the first comparison signal to control 6 work of compensation circuit
Make, control circuit 1 receives second level comparison signal or third level comparison signal so that warning circuit to be controlled to be alarmed step by step.
First comparing unit is preferably the comparator of LM393A models, and the in-phase end of the first comparing unit is to detect electric leakage mould
Intend the voltage between the output terminal of circuit 2 and ion grounding electrode 8, the end of oppisite phase of the first comparing unit is connected with default benchmark letter
Number Vref1, the output terminal of the first comparing unit export the first comparison signal, and the second comparing unit is preferably the ratio of LM393A models
Compared with device, the in-phase end of the second comparing unit to detect the voltage between the output terminal of leakage analog circuit 2 and ion grounding electrode 8,
The end of oppisite phase of second comparing unit is connected with default reference signal Vref2, the second ratio of output terminal output of the second comparing unit
Compared with signal, the 3rd comparing unit is preferably the comparator of LM393A models, and the in-phase end of the 3rd comparing unit is to detect electric leakage mould
Intend the voltage between the output terminal of circuit 2 and ion grounding electrode 8, the end of oppisite phase of the 3rd comparing unit is connected with default benchmark letter
Number Vref3, the output terminal of the 3rd comparing unit export the 3rd comparison signal, by the first comparison signal, the second comparison signal and
In the I/O mouths of the equal input control circuit 1 of 3rd comparison signal, in order to which control circuit 1 is controlled.
In one embodiment, as shown in Fig. 2, on the first comparing unit, the second comparing unit and the 3rd comparing unit
It is coupled with to adjust the adjustment unit of its a reference value, the adjustment unit of the first comparing unit is variable resistance VR1, the second ratio
Compared with unit adjustment unit for variable resistance VR2, the adjustment unit of the 3rd comparing unit is variable resistance VR3, by can
Variohm VR1, variable resistance VR2 and variable resistance VR3, can arbitrarily adjust reference signal, to correspond to ion earthing
The different damaged condition in pole 8.
Warning circuit includes first order alarm unit 41 and second level alarm unit 42, and first order alarm unit 41 corresponds to
Second level comparing unit 32, second level alarm unit 42 correspond to third level comparing unit 33, and first order alarm unit 41 passes through
Light, audible alarm, second level alarm unit 42 realize alarm by cutting off the power.
In one embodiment, as shown in figure 3, first order alarm unit 41 includes the first control units and the first display unit,
The first control units is preferably the triode Q1 and relay KM1 of NPN type, and the base stage of triode Q1 is coupled to the second comparing unit
Output terminal, and be controlled by the second comparison signal, the collector of triode Q1 connect power supply after being coupled to the coil of relay KM1,
The coil both ends of relay KM1 are parallel with sustained diode 1 so that the electricity in coil can pass through afterflow two when power is off
Pole pipe D1 is consumed, the emitter ground connection of triode Q1, and the normally opened contact of relay KM1 is connected to connection electricity after indicator light L1
Source, to control the keying of indicator light L1, first order alarm unit 41 is connected in the I/O mouths of control circuit 1, to control receiving
The signal of the output of circuit 1, if the signal is high level, triode Q1 conductings, indicator light L1 to be controlled to open, with to operation
Personnel carry out light warning, then illustrate that the ion grounding electrode 8 of the cabinet 7 connection is damaged there are problem, but not to people.
In one embodiment, as shown in figure 4, first order alarm unit 41 further includes the second control unit and the second display
Portion, the second control unit are preferably the triode Q2 and buzzer H of NPN type, and the base stage of triode Q2 is coupled to the second comparing unit
Output terminal, and be controlled by the second comparison signal, the collector of triode Q2 connects power supply, triode after being coupled to buzzer H
The emitter ground connection of Q2, second level alarm unit 42 is connected in the I/O mouths of control circuit 1, with to receiving the defeated of control circuit 1
The signal gone out, if the signal is high level, triode Q2 conductings, buzzer H to be controlled to open, with to operating personnel's carry out sound
Sound warns, then illustrates that the ion grounding electrode 8 of the cabinet 7 connection is damaged there are larger problem, but not to people.
Two embodiments of more than first order alarm unit 41 can be used alone, and can also be combined with each other.
In one embodiment, as shown in figure 5, second level alarm unit 42 includes control unit, control unit is preferably NPN type
Triode Q3 and relay KM3, the base stage of triode Q3 is coupled to the output terminal of the 3rd comparing unit, and is controlled by the 3rd ratio
Compared with signal, the collector of triode Q3 connects power supply after being coupled to the coil of relay KM3, and the coil both ends of relay KM3 are simultaneously
It is associated with sustained diode 3 so that the electricity in coil can be consumed by sustained diode 3 when power is off, triode
The emitter ground connection of Q3, the normally opened contact of relay KM3 is connected to the power supply of power distribution cabinet, to turn off the power supply of power distribution cabinet, the 3rd
Grade alarm unit 43 is connected in the I/O mouths of control circuit 1, with the signal of the output to receiving control circuit 1, if the signal is
High level, then triode Q3 conductings, by the dump of power distribution cabinet.
In one embodiment, as shown in fig. 6, further including switching circuit 5, switching circuit 5 is coupled to control circuit 1 with right
Detection is switched over automatic detection manually, and it is single that switching circuit 5 includes switching switch K1, automatic detection unit and detection manually
Member, the normally opened contact of switching switch K1 is coupled to manual detection unit, and its normally-closed contact is coupled to automatic detection unit, so as to
It realizes to detecting the switching with detecting automatically manually.
Automatic detection unit includes the triode Q4 and relay KM4 of NPN type, the base stage connection switching switch of triode Q4
The I/O mouths of control unit are accessed after the normally-closed contact of K1, it is automatic to realize in order to the signal that control unit offer detects automatically
Cycle detection, the collector of triode Q4 connect power supply, the coil both ends of relay KM4 after being coupled to the coil of relay KM4
It is parallel with sustained diode 4 so that the electricity in coil can be consumed by sustained diode 4 when power is off, three poles
The emitter ground connection of pipe Q4, the normally opened contact of relay KM4 is connected to the output terminal of leakage analog circuit 2, to control electric leakage mould
Intend whether circuit 2 normally exports.
Manual detection unit includes hand push button SW, and hand push button SW is in parallel after being connected with the normally opened contact of switching switch K1
In the both ends of the normally opened contact of relay KM4.
In automatic detection process, switching switch K1 is at normally-closed contact so that and automatic detection unit is in access always,
In order to which automatic detection unit can receive the cycle detection signal of the output of control circuit 1, triode Q4 is controlled by cycle detection
Signal realizes the discontinuity startup to leakage analog circuit 2, the function of self-test after certain interval of time is realized, if to cabinet 7
It needs first to be detected cabinet 7 in maintenance process, then says that the normally opened contact of switching switch K1 is closed, normally-closed contact is opened, then
Automatic detection is switched to manual detection, presses hand push button SW so that the output terminal and ion earthing of leakage analog circuit 2
Pole 8 turns on, so as to be detected manually.
In one embodiment, as shown in fig. 7, compensation circuit 6 includes trigger element, driving unit and heating unit；It touches
Bill member is coupled to leakage analog circuit 2 to receive analog current, and exports trigger signal；Driving unit is coupled to trigger element
To receive trigger signal, and output drive signal；Heating unit is coupled to driving unit to receive drive signal, and is controlled by drive
Signal is moved to be heated to ion grounding electrode 8.
In one embodiment, trigger element is preferably the derivative-type monostable flipflop of gate circuit composition, and circuit has one
A stable state, a temporary stable state, under external trigger signal effect, circuit is turned to temporary stable state by stable state, and temporary stable state cannot long Kubo
It holds, due to the effect of RC time delay processes in circuit, after a period of time, circuit can automatically return to stable state, and temporary stable state is held
The continuous time depends on the parameter value of RC circuits.
Derivative-type monostable flipflop can be made of NAND gate or OR-NOT circuit.
In one embodiment, as shown in fig. 7, trigger element is the monostable trigger unit being made of 555 chips, the list
555 circuit input end, 2 foot is in high level, 3 foot of output terminal output low level, as relay KM4 during stable trigger circuit stable state
Normally opened contact when being closed, then 2 feet are directly grounded, and give 2 foot one low level trigger signal, then the output of 3 foot of output terminal is high
Level, monostable circuit starts a steady-state process, when after a period of time, then the high level moment of 3 foot of output terminal draw
It is low to become low level, it gets ready for coming for next trigger pulse.
Driving unit includes the triode Q5 and relay KM5 of NPN type, and the base stage of triode Q5 connects 3 foot of output terminal, and
It is controlled by the monostable trigger unit of 555 chips composition, the collector of triode Q5 connects after being coupled to the coil of relay KM5
Power supply, the coil both ends of relay KM5 are parallel with sustained diode 5 so that the electricity in coil can be by continuous when power is off
Stream diode D5 is consumed, the emitter of triode Q5 ground connection, and the normally opened contact of relay KM5 connects after being connected with heating unit
Power supply is connect, to be heated to ion grounding electrode 8.
In one embodiment, heating unit is preferably silica gel heating sheet, and silica gel heating sheet is led using high temperature resistant, height
Heat, silicon rubber, heat safe fibre reinforced materials and the metal heating film circuit set that insulation performance is good, intensity is good form
Soft electric heating film element, the silica gel glass fabric formed by two glass fabrics and the biplate pressure silica gel system of closing are formed, by
In it be thin sheet products（Standard thickness is 1.5 mm）It has good flexibility, can be completely close with heating object
Contact.
In to 8 heating process of ion grounding electrode, since ion grounding electrode 8 includes filler, conductor packing material
Containing special electron ion compound, the moisture in air can be fully absorbed, by deliquescent effect, active electron ion is effectively released
It is put into soil, so as to improve the electric conductivity between the housing of ion grounding electrode 8 and soil, its ground resistance is reduced, so as to protect
The reliability of ion grounding electrode 8 is demonstrate,proved, ion grounding electrode 8 is added when being detected to ion grounding electrode 8, being carried out at the same time
Heat, to improve the conductive capability of soil, after between setting, heating unit stops heating, but soil have it is certain every
Thermal effect can keep temperature reduction in 8 certain time of ion grounding electrode slower, so as to which the conductive energy of soil can also be effectively ensured
Power is preferable, can reduce the probability of the damage of ion grounding electrode 8.
A kind of detection method of self-test power distribution cabinet, wherein the hardware or equipment,
Step 1：By switching circuit 5 with to detect manually with automatically detection switch over；
Step 2：If manual detection, then button press is to control the leakage analog circuit 2 in electric-leakage detection circuit to export
Analog current, and perform step 4；
Step 3：If automatic detection, then the leakage analog circuit 2 in the control of control circuit 1 electric-leakage detection circuit is automatic
Analog current is exported, and performs step 4；
Step 4：The voltage between the output terminal of the detection leakage analog of comparison circuit 3 circuit 2 and ion grounding electrode 8 is detected,
If detect the voltage detected by comparison circuit 3 more than second predetermined value, control circuit 1 controls warning circuit to be reported
It is alert, if detection comparison circuit 3 detects that the voltage that voltage exists or detects is more than first predetermined value, control compensation circuit
6 start, if detection comparison circuit 3 is not detected the voltage that voltage exists or detects and is less than first predetermined value, control electricity
Road 1 is controlled repeats step 1 after the predetermined S times；
Step 5：When the voltage between the output terminal of leakage analog circuit 2 and ion grounding electrode 8 falls into the second grade,
Then control unit controls first order alarm unit 41 by light, audible alarm, when the output terminal and ion of leakage analog circuit 2
When voltage between earthing pole 8 falls into the tertiary gradient, then control unit controls first order alarm unit 41 to pass through light, sound simultaneously
Sound and second level alarm unit 42 are by cutting off the power to realize same alarm.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of self-test power distribution cabinet, including cabinet and ion grounding electrode, the cabinet is connected with ion grounding electrode, it is characterized in that：
Electric-leakage detection circuit is also connected in parallel between the cabinet and ion grounding electrode, the electric-leakage detection circuit includes leakage analog
Circuit, detection comparison circuit, control circuit, warning circuit and compensation circuit；
The output terminal of the leakage analog circuit is connected to export analog current with ion grounding electrode；
The detection comparison circuit is used to detect the voltage between the output terminal and ion grounding electrode of leakage analog circuit to export
Detect signal；
The control circuit is coupled to detection comparison circuit to receive detection signal, and exports control signal control leakage analog electricity
Road, detection comparison circuit, warning circuit and compensation circuit；
The warning circuit is coupled to control circuit to receive control signal, and is alarmed in response to control signal with realizing；
The compensation circuit is coupled to control circuit, and is controlled by control circuit to be heated to ion grounding electrode；
When the detection comparison circuit detects that voltage difference is big between the output terminal and ion grounding electrode of detection leakage analog circuit
When second predetermined value, the control circuit control warning circuit alarm, when the detection comparison circuit detects detection electric leakage
When being more than first predetermined value there are voltage or voltage difference between the output terminal and ion grounding electrode of analog circuit, the control electricity
Road control compensation circuit compensates, and is compensated automatically according to detected voltage swing, to offset leakage analog circuit
Output terminal and ion grounding electrode between existing voltage difference；When the detection comparison circuit detects the defeated of leakage analog circuit
When voltage being not present between outlet and ion grounding electrode or when voltage difference is less than first predetermined value, the control circuit control leakage
Power detection circuit periodically starts at predetermined intervals, and wherein second predetermined value is more than first predetermined value.
2. self-test power distribution cabinet according to claim 1, it is characterized in that：The detection comparison circuit is provided with several grades.
3. self-test power distribution cabinet according to claim 2, it is characterized in that：It is more single that the detection comparison circuit includes the first order
Member, second level comparing unit and third level comparing unit；
The first predetermined value is a reference value of first order comparing unit；
The second predetermined value is a reference value of second level comparing unit；
The first order comparing unit, second level comparing unit, third level comparing unit are corresponded to according to voltage from small to large respectively
The first estate of distribution, the second grade, the tertiary gradient；
The first order comparing unit is coupled between the output terminal and ion grounding electrode of leakage analog circuit, to export the first order
Comparison signal；
The second level comparing unit is coupled between the output terminal and ion grounding electrode of leakage analog circuit, to export the second level
Comparison signal；
The third level comparing unit is coupled between the output terminal and ion grounding electrode of leakage analog circuit, to export the third level
Comparison signal；
The first order comparing unit, second level comparing unit, third level comparing unit are coupled with control circuit, the control
Circuit receives first order comparison signal so that compensation circuit to be controlled to work, and the control circuit receives second level comparison signal or the 3rd
Grade comparison signal is to control warning circuit to be alarmed step by step.
4. self-test power distribution cabinet according to claim 3, it is characterized in that：The warning circuit include first order alarm unit with
Second level alarm unit；
The first order alarm unit corresponds to second level comparing unit, and the second level alarm unit compares corresponding to the third level
Unit；
The first order alarm unit passes through light, audible alarm；
The second level alarm unit realizes alarm by cutting off the power.
5. self-test power distribution cabinet according to claim 1, it is characterized in that：Further include switching circuit；
The switching circuit is coupled to control circuit and receives the control of control circuit, which provides two kinds of Working moulds
Formula, be respectively manually detection with automatically detect receive external control instruction into line control circuit after two kinds of operating modes are selected
Select switching.
6. self-test power distribution cabinet according to claim 1, it is characterized in that：The compensation circuit includes trigger element, driving list
Member and heating unit；
The trigger element is coupled to leakage analog circuit to receive analog current, and exports trigger signal；
The driving unit is coupled to trigger element to receive trigger signal, and output drive signal；
The heating unit is coupled to driving unit to receive drive signal, and is controlled by drive signal to add to ion grounding electrode
Heat.
7. self-test power distribution cabinet according to claim 6, it is characterized in that：The trigger element is the list being made of 555 chips
Stable state trigger element.
8. self-test power distribution cabinet according to claim 3, it is characterized in that：First order comparing unit, second level comparing unit and
It is coupled with to adjust the adjustment unit of a reference value on third level comparing unit, the adjustment unit of first order comparing unit is the
One variable resistance, the adjustment unit of second level comparing unit are the second adjustable resistance device, the adjusting list of third level comparing unit
Member is the 3rd variable resistance, can be random by the first variable resistance, the first variable resistance and the first variable resistance
Reference signal is adjusted, to correspond to the different damaged condition of ion grounding electrode.
9. self-test power distribution cabinet according to claim 1, it is characterized in that：If detection comparison circuit detect voltage exist or
Voltage is more than first predetermined value, then compensation circuit is controlled to start, to be heated to ion grounding electrode.
10. a kind of detection method of self-test power distribution cabinet, wherein self-test power distribution cabinet include cabinet and ion grounding electrode, the cabinet with
Ion grounding electrode connects, and electric-leakage detection circuit, the detection of electrical leakage are also connected in parallel between the cabinet and ion grounding electrode
Circuit includes leakage analog circuit, detection comparison circuit, control circuit, warning circuit and compensation circuit；The leakage analog electricity
The output terminal on road is connected to export analog current with ion grounding electrode；The detection comparison circuit is used to detect leakage analog circuit
Output terminal and ion grounding electrode between voltage to export detection signal；The control circuit be coupled to detection comparison circuit with
Detection signal is received, and exports control signal control leakage analog circuit, detection comparison circuit, warning circuit and compensation circuit；
The warning circuit is coupled to control circuit to receive control signal, and is alarmed in response to control signal with realizing；The compensation
Circuit is coupled to control circuit, and is controlled by control circuit to be heated to ion grounding electrode, it is characterized in that：
Step 1：By using a switching circuit to be switched over to detecting manually with detection automatically, the switching circuit coupling
In control circuit and receive the control of control circuit, which provides two kinds of operating modes, be respectively detection manually with from
It is dynamic detect receive external control instruction into line control circuit after switching is made choice to two kinds of operating modes；
Step 2：If manual detection, then button press is to control the leakage analog circuit output in electric-leakage detection circuit to simulate
Electric current, and perform step 4；
Step 3：It is detected if automatic, then the leakage analog circuit in control circuit control electric-leakage detection circuit exports mould automatically
Intend electric current, and perform step 4；
Step 4：The voltage between the output terminal and ion grounding electrode of comparison circuit detection leakage analog circuit is detected, if detection
When voltage detected by comparison circuit is more than second predetermined value, then control circuit control warning circuit is alarmed, if detection
Comparison circuit detects that the voltage that voltage exists or detects is more than first predetermined value, then compensation circuit is controlled to start, if inspection
It surveys the voltage that comparison circuit is not detected voltage presence or detects and is less than first predetermined value, then control circuit control is by pre-
Step 1 is repeated after the fixed S times, and wherein second predetermined value is more than first predetermined value；
Step 5：When the voltage between the output terminal and ion grounding electrode of leakage analog circuit falls into the second grade, then control
Unit controls first order alarm unit by light, audible alarm, when leakage analog circuit output terminal and ion grounding electrode it
Between voltage when falling into the tertiary gradient, then control unit controls first order alarm unit to pass through light, sound and second simultaneously
Grade alarm unit is by cutting off the power to realize same alarm；
Wherein described first predetermined value is a reference value of first order comparing unit；
The second predetermined value is a reference value of second level comparing unit；
The first order comparing unit, second level comparing unit, third level comparing unit are corresponded to according to voltage from small to large respectively
The first estate of distribution, the second grade, the tertiary gradient；
The first order comparing unit is coupled between the output terminal and ion grounding electrode of leakage analog circuit, to export the first order
Comparison signal；
The second level comparing unit is coupled between the output terminal and ion grounding electrode of leakage analog circuit, to export the second level
Comparison signal；
The third level comparing unit is coupled between the output terminal and ion grounding electrode of leakage analog circuit, to export the third level
Comparison signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510684233.2A CN105207062B (en) | 2015-10-20 | 2015-10-20 | Self-test power distribution cabinet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510684233.2A CN105207062B (en) | 2015-10-20 | 2015-10-20 | Self-test power distribution cabinet |
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| CN105207062A CN105207062A (en) | 2015-12-30 |
| CN105207062B true CN105207062B (en) | 2018-05-18 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785961A (en) * | 2016-12-05 | 2017-05-31 | 安徽永川电气设备有限公司 | Workshop power distribution cabinet |
| CN106785948A (en) * | 2016-12-05 | 2017-05-31 | 安徽永川电气设备有限公司 | Voltage stabilizing power distribution cabinet |
| CN106451123A (en) * | 2016-12-05 | 2017-02-22 | 安徽永川电气设备有限公司 | Voltage-stabilizing anti-surge power distribution cabinet |
| CN109309346A (en) * | 2018-12-12 | 2019-02-05 | 江苏坤威电力科技有限公司 | A kind of self-test power distribution cabinet |
| CN109450250B (en) * | 2018-12-18 | 2020-12-29 | 浙江西子重工机械有限公司 | Periodic self-checking switching power supply and control method thereof |
| CN110086259A (en) * | 2019-05-16 | 2019-08-02 | 成都电精灵电力科技有限公司 | A kind of operation power maintenance preventive trial early warning system and self-management system |
| CN111478204A (en) * | 2020-03-30 | 2020-07-31 | 深圳市三巨电机有限公司 | Protection device and distribution box with same |
| CN112462743A (en) * | 2020-11-30 | 2021-03-09 | 贵州航天风华实业有限公司 | Intelligent distribution box controller test system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103207331B (en) * | 2013-03-12 | 2015-07-29 | 中国铁路通信信号上海工程集团有限公司 | The switching value that lightning protection device damages and stake resistance real time on-line monitoring system and method |
| KR101287173B1 (en) * | 2013-03-13 | 2013-07-17 | 에이치엠이 주식회사 | Ground monitor |
| CN203405528U (en) * | 2013-08-08 | 2014-01-22 | 惠州华阳通用电子有限公司 | Grounding detection apparatus |
| CN203561719U (en) * | 2013-11-08 | 2014-04-23 | 联想(北京)有限公司 | Ground wire connection state detecting and alarming device, and power source |
| CN203811745U (en) * | 2014-01-17 | 2014-09-03 | 河北博为电气有限公司 | Disconnection detection device for resistor in resistor cabinet |
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